I have dual citizenship (USA& El Salvador). My income is from a Salvadorean company. I pay taxes in El Salvador. How can I get credit for this amount paid in El Salvador?

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Did you live in USA or El Salvador during 2018 or was it partly in US and partly in  El Salvador?  How did you earn in El Salvador?

As a citizen of USA  you are taxed on world income no matter where earned.  Fo foreign earned income while  living in the USA ( i.e. tax home is USA ), any taxes paid to El Salvador is eligible for foreign tax credit or deduction if you itemize.  Tell me more about your situation.